Discussion
Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. ABC, GFE, MJG, SNI, ?
Answer: D
The series is ABC, GFE, MJG, SNI, ?. Each letter in the cluster follows its own rule. The first letters are A, G, M, S, so each is 6 places after the one before, and the next is Y. The second letters are B, F, J, N, each 4 places on, so the next is R. The third letters are C, E, G, I, each 2 places on, so the next is K.
The cluster that replaces the question mark is therefore YRK. The options ZRK and SRK break the rule for the first letter (it must be Y), and YRL breaks the rule for the third (it must be K). Only YRK follows all three rules.
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